Help 98 ISB xmission

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Gordon - 11 Mar 2007 18:10 GMT

I have a 98.5 cummins ISB with a 5 speed manual. I had a new clutch
put in at 180k miles. Shortly thereafter I started having problems.
I would come to a stop and go to shift into low but it wasn't
possible to go into any gear! This was purely intermittant. Work one
time but not the next! If you turn the engine off, it shifts easily into
any gear.
The clutch feels good with plenty of pedal.
I took it back to the shop that put in the clutch and they tore it
down but could find no problem. While in there they replaced the
throwout again and inspected the pilot (or vice versa) They also
replaced the slave cylinder. No help!
Next, they replaced the master and again no help!

So what next? Anybody got any ideas?

Thanks
Gordon

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Tom Lawrence - 11 Mar 2007 22:35 GMT

> So what next? Anybody got any ideas?

Just a thought... did you inspect the bellhousing for any cracks? Way back
when, on a friend's F-150, he had the same kinds of shifting problems.
Turned out the bellhousing was cracked, and moving/flexing when the clutch
was applied, and not exerting as much force on the throwout bearing.

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Gordon - 11 Mar 2007 22:56 GMT

>> So what next? Anybody got any ideas?
>
> Just a thought... did you inspect the bellhousing for any cracks? Way back
> when, on a friend's F-150, he had the same kinds of shifting problems.
> Turned out the bellhousing was cracked, and moving/flexing when the clutch
> was applied, and not exerting as much force on the throwout bearing.

I've been wondering about the same types of things. Broken motor
mount or xmission mount, etc. Obviously, the input shaft has to be
turning and I'm thinking something binding because it isn't being held
in position.
Gordon

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